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A swimmer is at the bottom of a 5-meter pool, where the gauge pressure (pgh) is approximately 0.5Patm. If the swimmer rises to the surface, by how much does the total pressure change?

A. The total pressure increases by 33%

B. The total pressure increases by 66%

C. The total pressure decreases by 33%

D. The total pressure decreases by 66%

So using Ptotal = Patm + Pgauge

Initially

Ptotal = 1.5 atm

Final

Ptotal = 1 atm

So 1/1.5 = 66% so shouldn't the pressure decrease by 66%? What am I doing wrong? The answer is

**C**btw. Thanks!